Control Visualization, metricbeat field , values not showing. v7.13

Hi, Im having problems to display values in the control visualization, the field that I need to use is created by metricbeat.

in discovery I can see the values, and the field exist

In index patterns there is a field and

when I choose no values are displayed (tried with and without the visualization option: use time filter) and the pop up says that the field doesnt exist.

when I choose the values are displayed

but it throws an error


that says :

Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [] in order to load field data by uninverting the inverted index. Note that this can use significant memory.

What can I do to solve this?

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